Abstract
A procedure for producing cylindrical samples of TiNi shape memory alloy was desired in order to be able economically to provide thermomechanical test specimens to support a constitutive and behavioral modeling effort. The initial development and results of such a procedure are presented in this work. Elemental powders were mixed to ratios of 50.0 and 50.6 at.% Ni, packed and sealed into stainless steel containers, hot isotatically pressed (HIPed) at 200 MPa and 900–1050°C, and machined to expose a gauge section of consolidated TiNi material for thermomechanical testing. Some samples of material were used for DSC analysis to determine transformation temperatures as well as for microscopic examination. Effects of HIPing and post-consolidation heat treatments on the material microstructure and transformation behavior were measured via SEM and DSC analyses. Specimens of approx. 99% theoretical density and nearly homogeneous TiNi microstructures were produced. The specimens were mechanically tested in tension and compression and were shown to exhibit moderate degrees of the shape memory effect and pseudoelasticity.
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